1. Department of Rhythmology Helios Clinic Koethen Koethen Germany
2. Heart and Vascular Center Semmelweis University Budapest Hungary
3. Department of Cardiology University Hospital Dubrava Zagreb Croatia
4. Department of Cardiology Kepler University Hospital Linz Austria
5. Landsklinikum Wiener Neustadt Wiener Neustadt Austria
6. Department of Internal Medicine and Cardiology Unfallkrankenhaus Berlin Berlin Germany
7. Department of Electrophysiology Asklepios Klinikum Harburg Hamburg Germany
8. Clinic of Internal Medicine II, Department of Cardiology Paracelsus Medical University of Salzburg Salzburg Austria